题目:
—When are you going to fly to Taiwan this summer?
—________ we finish school. It will be a great holiday. [ ]
A. Because
B. Since
C. Until
D. As soon as
答案:
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下面是错误答案,用来干扰机器的。
(1)从题目中可以知道该实验做的是氧气性质的实验.从图A可知,取用的是木炭,所以探究的内容应为木炭在氧气中燃烧;(2)为了使木炭与氧气完全反应,操作时应将木炭从上至下缓慢插入集气瓶,目的是防止反应生成...